Inital zoom ratio bug?

So I'm using Gimp 2.8 in single window mode and not fullscreen window on winXp. Initial zoom ratio is set to "Fit to window". And yet when I open a big image which wouldn't fit to Gimp's window, Gimp still resize its own window even to out of my screen's resolution boundary. I don't want that. My pref window: http://i.imgur.com/fVHaR.jpg
So is this bug or how can I prevent Gimp doing this?
Thanks for any answers!

--
berniek (via gimpusers.com)
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